Abstract

Micropsectra sedna (Oliver, 1976) is a parthenogenetic midge from the Canadian Arctic. The parthenogenetic mechanism is apomictic thelytoky, with a restitutional division during oogenesis, as found in other parthenogenetic Chironomidae. It is triploid, with two similar chromosome sets, and the third is relatively dissimilar, pairing little with the diploid set. Two karyotypes were observed: a single individual with eight polytene elements in the salivary glands (3n=12), considered standard, while the majority of larvae showed only seven polytene chromosomes (3n=11). Hybrid speciation is considered likely, although chromosomal recombination following the origin of thelytoky has played some part in karyotype evolution. A single morphologically distinct larva was also found, which might be the donor of the haploid chromosome set. The apomictic restitutional system is compared to that of the other, independently derived, parthenogenetic Chironomids to assess the extent of similarity between species.

Addeddate

2025-03-14 00:50:30

Bhl_virtual_titleid

210879

Bhl_virtual_volume

v.5:no.4 (2011)

Call number

10_3897_compcytogen_v5i4_1356

Call-number

10_3897_compcytogen_v5i4_1356

Foldoutcount

0

Genre

article

Identifier

cytogeneticspar5mart

Identifier-ark

ark:/13960/s21mt0vsrwr

Identifier-bib

10_3897_compcytogen_v5i4_1356

Identifier-doi

10.3897/compcytogen.v5i4.1356

Issue

4

Ocr

tesseract 5.3.0-6-g76ae

Ocr_detected_lang

en

Ocr_detected_lang_conf

1.0000

Ocr_detected_script

Latin

Ocr_detected_script_conf

1.0000

Ocr_module_version

0.0.21

Ocr_parameters

-l eng

Page_number_confidence

88

Page_number_module_version

1.0.5

Page_range

315-328

Pages

14

Pdf_degraded

invalid-jp2-headers

Pdf_module_version

0.0.25

Possible copyright status

In copyright. Digitized with the permission of the rights holder.

Ppi

300

Source

Comparative Cytogenetics 5(4)

Year

2011

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